13.(23+22)-3(17+28)

=13.45-3.45

=(13-3).45

=10.45

=450

​Tick mình mình là người đầu tiên nhákudosinichi

13.(23+22)-3(17+28)

=13.45-3.45

=45.(13-3)

=45.10

=450

tick nha

\(a,-215-358+215+\left(-42\right)\\ =\left(-215+215\right)+\left(-358-42\right)\\ =0-400\\ =-400\\ b,13\cdot\left(23+22\right)-3\cdot\left(17+28\right)\\ =13\cdot45-3\cdot45\\ =45\cdot\left(13-3\right)\\ =45\cdot10\\ =450\)

( -12 ).47 + ( - 12 ).52 + ( -12 ) 

= ( -12 ).( 47 + 52 + 1 ) 

= ( -12 ).100

= -1200

13.(23 + 22 ) - 3.( 17 + 28 ) 

= 13.45 - 3.45

= 45.(13 - 3 ) 

= 45.10

=450

(-12).47 + (-12).52 + (-12)

= (-12).47 + (-12).52 + (-12).1

= (-12) . ( 47+52+1)

= (-12) .100

= -1200.

(-12).47+(-12).52+(-12)

=(-12).(47+52+1)

=-1200

13.(23+22)-3.(17+28)

=13.45-3.45

=45.(13-3)

=450

happy new year

13 . ( 23 + 22 ) - 3 . ( 17 + 28 )

= 13 . 45 - 3 . 45

= ( 13 - 3 ) . 45

= 10 . 45

= 450

Tick mình nhé !

 13.(23+22)-3.(17+28)

= 13. 45 - 3. 45

= 45 .(13 -3 )

= 45 . 10

= 450

=13.23+13.22-3.17+3.28

=299+286-51+84

=618

1) \(35.18-5.7.28\)

\(=35.18-35.28\)

\(=35.\left(18-28\right)\)

\(=35.\left(-10\right)\)

\(=-350\)

2) \(45-5.\left(12+9\right)\)

\(=45-60-45\)

\(=\left(45-45\right)-60\)

\(=0-60\)

\(=-60\)

3) \(24.\left(16-5\right)-16.\left(24-5\right)\)

\(=\left(384-120\right)-\left(384-120\right)\)

\(=264-264\)

\(=0\)

4) \(13.\left(23+22\right)-3.\left(17+28\right)\)

\(=13.45-3.45\)

\(=\left(13-3\right).45\)

\(=10.45\)

\(=450\)

tk ủng hộ nha!!!!!!!!1

1/ 35 . 18 - 5 . 7 . 28

= 35 . 18 - 35 . 28

= 35 . (18 - 28)

= 35 . (-10)

= -350

2/ 45 - 5 . (12 + 9)

= 5 . 9 - 5 . 12 + 5 . 9

= 5 . (9 - 12 + 9)

= 5 . 6

= 30

3/ 24 . (16 - 5) - 16 . (24 - 5)

= 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5

= (24 . 16 - 16 . 24) - (24 . 5 - 16 . 5)

= 0 - [5 . (24 - 16)]

= 0 - [5 . 8]

= 0 - 40

= -40

4/ 13 . (23 + 22) - 3 . (17 + 28)

= 13 . 45 - 3 . 45

= 45 . (13 - 3)

= 45 . 10

= 450

Xin lỗi, cho mk sửa lại ý 2, các ý còn lại đúng rùi đó!

2/ 45 - 5 . (12 + 9)

= 5 . 9 - 5 . 12 - 5 . 9

= -(5 . 12)

= -60

\(13.\left(23+22\right)-3.\left(17+28\right)\)

\(=13.23+22-3.17+28\)

\(=13.\left(23+17\right)-3\left(22+28\right)\)

\(=13.40-3.50\)

\(=520-150=370\)

\(-48+48.\left(-78\right)+48.\left(-21\right)\)

\(=48.\left[-78+\left(-21\right)-1\right]\)

\(=48.\left(-100\right)=-4800\)

Bài này giống bài 1 trong bài thi cuối kì của trường tôi thế nhỉ

1.

\(35\times\left(14-23\right)-23\times\left(14-35\right)\)

\(=35\times14-35\times23-23\times14+23\times35\)

\(=\left(23\times35-35\times23\right)+14\times\left(35-23\right)\)

\(=0+14\times12\)

\(=168\)

2.

\(27\times\left(13-16\right)-16\times\left(13-27\right)\)

\(=27\times13-27\times16-16\times13+16\times27\)

\(=13\times\left(27-16\right)+\left(27\times16-16\times27\right)\)

\(=13\times11+0\)

\(=143\)

3.

\(44\times\left(-36\right)+22\times\left(-28\right)\)

\(=22\times2\times\left(-36\right)+22\times\left(-28\right)\)

\(=22\times\left(-72\right)+22\times\left(-28\right)\)

\(=22\times\left[\left(-72\right)+\left(-28\right)\right]\)

\(=22\times\left(-100\right)\)

\(=-2200\)

Chúc bạn học tốt

`a)3/5+(-4/9)`

`=3/5-4/9`

`=27/45-20/45`

`=7/45`

`b)3/5+2/5 . 15/8`

`=3/5 + 30/40`

`=3/5+3/4`

`=12/20+15/20`

`=27/20`

`c)7/2 . 8/13 + 8/13 . (-5/2)`

`=8/13 . (7/2 +(-5)/2)`

`=8/13 . 1`

`=8/13`

`d)-5/17 . (-9/23)+9/23 . (-22/17) + 11 9/23`

`=-5/17 . (-9/23) + 9/23 . (-1) . 22/17 + 11 + 9/23`

`=-5/17 . (-9/23) + (-9/23) . 22/17+11+9/23`

`= -9/23 ( -5/17 + 22/17)+11+9/23`

`= - 9/23 . 1+11+9/23`

`=-9/23+11+9/23`

`=(-9/23+9/23)+11`

`=0+11`

`=11`

a: =27/45-20/45=7/45

b: =3/5+30/40

=3/5+3/4

=12/20+15/20

=27/20

c: =8/13(7/2-5/2+1)=8/13*2=16/13

d: =9/23*5/17-9/23*22/17+11+9/23

=-9/23+11+9/23

=11

56666666

a, (-17)  + 21 + 79 + 17

= (-17 + 17) + (21 + 79)

= 0 + 100

= 100

b, 40 + 22 + (-16)  + (-44)

= 40 + {(-16) + (-44} + 22

= 40 - 60 + 22

= - 20 + 22

= 2 

c, (-12) + (-47) + (-28) + 47

=  - (12 + 28) + (-47 + 47)

= - 40 + 0
= - 40

d, (- 5) + (-3) + 35 + (-17)

= (-5 + 35) - (3 + 17)

=  30 - 20

=  10 

e, 21.23 - 3.7.(-17)

= 21.23 + 21.17

= 21.(23 + 17)

= 21. 40

= 840